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Accrued and other liabilities and prepaid expenses and other current assets: - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accrued and other liabilities and prepaid expenses and other current assets:
Prepaid commissions, current portion	$ 18,783	$ 15,751
Prepaid taxes	21,061	32,826
Prepaid operating expenses	34,260	32,011
Total	$ 74,104	$ 80,588

X

- Definition

Amount of asset related to consideration paid in advance for commissions that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccoi_
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X

- Definition

Amount of asset related to consideration paid in advance for operating expenses that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccoi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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X

- Definition

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (g)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 340
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483032/340-10-45-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 340
-SubTopic 10
-Name Accounting Standards Codification
-Section 05
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482955/340-10-05-5

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